FIG. 3.

Maximum-likelihood tree of DNA pol fragments. Quartet puzzling support values for the maximum-likelihood tree and bootstrap values for a corresponding neighbor-joining tree are shown as percentages to the lower left of the appropriate node or as indicated by elongated black arrowheads; NA means the NJ tree topology differs at that node. The vertical black lines and letters to the right of the tree indicate virus families as follows: A, Asfarviridae; B, Baculoviridae; H, Herpesviridae; P, Phycodnaviridae. The Phycodnaviridae are also indicated in boldface lettering. The scale bar represents the number of amino acid substitutions per residue.